Automatic relief-valve and cylinder-cock.



Nu. 674,04l.

Patented May l4, l90l. F. SCHREIUT. I AUTOMATIC RELIEF VALVE AND CYLINDER COCK.

(Application filed July 10, 1899.: (No Model.)

t: ml m I I WITNESSES J7 6M WKM [NI/ENTER til FRANK SOHREIDT, OF MANSFIELD, OHIO.

AUTOMATIC RELIEF-VALVE AND CYLINDER-COCK.

SPECIFICATION forming part of Letters Patent No. 674,041, dated May 14, 1901.

Application filed July 10, 1899.

T0 rtZZ whom it may concern:

Be it known that I, FRANK SCHREIDT, a citizen of the United States, and a resident of Mansfield, in the county of Richland and State of Ohio, have invented certain new and useful Improvements in Automatic Relief- Valves and Cylinder-Cocks, of which the following is a specification.

The object of my invention is an automatic relief-valve which may be set to open when the pressure exceeds a certain amount, combined with an automatic cylinder-cock which will open for the escape of the fluid when the pressure falls below a certain amount. This object is attained by the means described in the annexed specification and illustrated in the accompanying drawings, in which- Figure 1 is a vertical diametrical sectional view of my automatic reliefvalve and cylinder-cock, the relief-cock and its controllingspring being shown in elevation and provided with a hand-wheel for opening the cock at any time desired. Fig. 2 is a detail elevation of a modified form of cylinder cock, showing a lever for opening the cock. Fig. 3 is a sectional plan view taken upon line 00 a? of Fig. 1. Fig. 4 is a detail plan view of the slipping collar.

Referring to the parts, which are indicated by similar reference-letters wherever they occur throughout the various views, the valvecase A has at its lower end an eXteriorlyscrew-threaded extension at for attachment to a steam-cylinder and an interiorly-screwthreaded lateral extension at to be connected to an exhaust-pipe. The upper portion of the shell A is interiorly screw-threaded to receive the lower'exteriorly-screw-threaded end of the shell B, which is interiorly screwthreaded at its upper end to receive the exteriorly-screw-threaded shell 0, by which the tension of the mainspring D, which holds the valve E to its seat a is regulated. This spring bears at its upper end against the loose disk d and at its lower end upon the slipcollar 01, which rests upon the top of the valve E. After the spring D has been put under the desired pressure by screwing the shell G into shell B the two shells are locked in the position by the nut c.

The valve E is a cylindrical shell turned off at the lower end upon the exterior to fit Serial No. 723,270. (No model.)

the seat a snugly and upon the interior to seat the cylindrical cock F, which has an upwardly-extendingstemfand wingsf to guide it in the valve-shell E, which has in its sides eductiou-ports e, 6, e and e for the escape of the fluid from the cylinder after the cock F has been thrown down from its seat by the auxiliary spring f which is compressed between the collar f upon the stem f and the disk d. The collar f striking against the slip-collar d when the cock is thrown down from its seat, limits the lower motion of the cock.

In use when the pressure in the cylinder exceeds that at which the mainspring is set the valve is thrown from its seat together with the cylinder-cock and remains unseated until the pressure has been reduced to the desired point. When the engine ceases working, the steam in the cylinder cooling lowers the pressure, when the spring f throws the cylinder-cock down from the seat and the steam passes out through the eduction-ports e, 6, c and e.

The shell O is interiorly screw-threaded and within it is an eXteriorly-screw-threaded cup G, which has a stem g, extending up through a perforation in the partition 0 of the shell and the nut c which closes the top of the shell, and terminating in a hand-wheel g, by turning which the cup G may be made to bear upon the stemf and carry the cylinder-cock down from its seat.

With the modification shown in Fig. 2 the cup G with its stem 9 and hand-wheel g are omitted and the stem f of the cylinder-cock is carried up through the partition 0 and nut c and bears against a hand-lever G, which is pivoted in lugs 0 upon the nut 0 By the depression of lever G the cylinder-cock is thrown from its seat.

What I claim is 1. The combination of a valve-case to be secured to a cylinder, a relief-valve consisting of a shell with eduction-ports in its sides seated within the case, a collar resting on top of the shell and having a stem extending upward through the collar, a spring pressing down on the collar, a second casing surrounding said spring screwed into the first casing,

and a spring for throwing the cylinder-cock from its seat against a reduced pressure for casing, a spring for throwing the cylindercock from its sea-t against a reduced pressure for the escape of Water from the cylinder, and means for bringing pressure to bear on the stem at will for throwing the cylinder-cock from its seat, substantially as shown and dethe escape of water from the cylinder, substantially as shown and described.

2. The combination of a valve-ease to be secured to a cylinder, a relief-valve eonsist- I ing of a shell with eduction-ports in its sides seated within the case, a collar resting on top of the shell a cylinder-cock seated against the scribed. lower edge of the shell and having a stem ex- FRANK SOI-IREIDT. tending up through the collar, a spring press- Witnesses:

L. P. BENNETT, OHAs. E. SCHREIDT.

ing down upon the collar, a second casing surrounding said spring screwed into the first 1 

